Automatic spring-trip for cultivator-shovels.



Patnted Aug. l5, I899.

W. SOBEY.

AUTOMATIC SPRING TRIP FOR CULTIVATOR SHUVELS.

(Application filed Febv 17, 1899.}

(N0 Model.)-

jaw/LEI? UNITED I STAT-Es I PATENT QFFIGE.

WILLIAM soBEY, or anemia, WISCONSIN, ASSIGNOR TO THE J. I. CASE PLOW WORKS, on SAME PLACE.

AUTOMATIC SPRING-TRIP Fo CU LTlVATOR-SHOVELS.

sPncIF'IcATmN forming part of Letters Patent No. 631,232, dated August 1 5, 1899.

Application filed February 17, 1899. $erial No. 705,767- (No model.)

To all whom, it may concern:

Be it known that I, \VILLIAM SOBEY, a resident of the city and county of Racine, Statev of Wisconsin, have invented certain new and useful Improvements in Automatic Spring- Trips for Cultivator-Shovels, of which the following is hereby declared to be a full, clear, and exact description.

The invention designs to provide an automatic spring-trip for cultivator-shovels, the same beingcapable of ready adjustment in setting the shovels at various angles for proper operation of the gangs under different conditions of the soil.

The nature of the improvement will appear in detail from the description following and be more particularly pointed out by the claim at the conclusion thereof.

On the drawings which accompany, Figure 1 is a side elevationat the rear. of a cultivatorstandard with the improved spring-trip for the shovel attached thereto. Fig. 2 is a sectional view on line 2 2 of Fig. 1; Fig. 3, an enlarged detail at the outer face of the heel of the shovel-sleeve; Fig. 4, a longitudinal sectional view at the mid-line of said bifurcated heel, Fig. 3, showing its outer serrated dual faces; Figs. 5 and 6, front and side elevational views, respectively, of the serrated washer engaging each face of the bifurcated heel of the shovel-sleeve.

As shown by the drawings, the lower rear end of the ordinary beam or standard A is snugly received between the lips of the bifurcated sleeve B, carrying the shovel O in familiar. fashion, the sleeve B being pivoted at a to the standard. Back of pivot a the heel of sleeve Bis generally forked, the dual heel extensions 1) having outer serrated faces I) with grooves b and elongated slotb' cut across them. The slot 17 and terminal grooves 12 at each end thereof have their defining-walls struck on a circle from pivot a as a center.

Engaging the outer face of heel extensions 1) are the washers E, Figs. 2, 5, and 6, correspondingly corrugated, as at e, to fit'the serrations b of the heel-face and carrying guide-lugs e to slide in the grooves?) of said heels. Hub 6 at the external face of each washer E, loosely sets within a hole therefor made in the terminal of the parallel links F,

constituting the lower member of the toggle connection. Bolt D passes through said links F at the washers E and also through slots 12 of the sleeve-heel and as well through the intermediate spacer or thimble G. The bolt stoutly secures the parts in assigned relation according to the desired angle which the shovels are to assume in cultivating the soil.

The pair of toggle links F embrace the shovel-standard A, being pivotally united above, as at f, to the companion set of toggle-links F. Said parallel links F also receive the shovel-standard between them and pivot thereto near the upper terminals, as at f Stop-blocks H, secured by rivets or the like at h between the links F, abut against the confronting edge of the shovel-standard to determine the location of the toggle mechanism when the parts have assumed the position proper for quick response in breaking joint should the shovel encounter any unusual obstruction.

Here shown pivotally secured between toggle-links F at a point f 3 beneath the standard A is the tension-rod K, which extends forward and passes loosely through an adjusting-nut N, threaded to a fixed lug M, de pendent from standard A. Coil-spring L encircles rod K and is retained between terminal Washers p 10, carried on said rod. By applying a wrench to the head at of" nut N spring L can be distended or relaxed at will to vary the pressure exerted thereby on toggle F F in resisting the thrust of the shovel when its sleeve B tends to turn about pivot a.

A glance at Fig. 1 shows the toggle-pivots f f to be nearly alined with the pivot-bolt D. This relation must be nicely maintained if the trip ofi is to occur neither prematurely nor tardily; but when shovel O is reset at a diiferent angle, as often occurs, to adapt the machine to various conditions of the soil the toggle-pivots f f become more or less disalined from bolt-pivot I). This change may render the trip-off action either too sensitive or else too sluggish. If too sluggish, the shovel mechanism may be broken. If too sensitive, the shovels are thrown out by minor obstacles.

To correct the difficulty named, some forms of prior machine provide for a readjustment of stop-block H; but according to the present improvement no such change in the position of the stop-block, always calling for nicety of skill, need be resorted to. The variation in angle for shovel O is effected by loosening the pivot-bolt D. Thereupon if sleeve B be turned about its standard-pivot a the serrated heel extensions of said sleeve describe an are from pivot a as a center. The serrations b on the heel-faces and the confronting serrations e on the companion washers E admit of a minute readjustment of the parts while guide-lugs a travel in grooves b to insure the place of bolt D always at a fixed distance from pivot a throughout. \Vithin the requisite limits of readjustment necessary in practice the changes noted still permit the toggle-links to realine themselves, preserving the desired relation with pivotbolt D, which obviously keeps the trip-off action at about the same degree of sensitiveness under all conditions.

The details of structure can be varied according to the mechanies skill without departure from the invention. Thus the tension-spring L can be located over instead of beneath the standard A, it being merely requilinks, of the shovel-sleeve pivotally united.

to the standard-shank and having a serrated rear heel with slotted groove therein defined from such pivot, the correspondingly-corrugated side washer carried at the lower terminal of the toggle-links to adjustably engage the sleeve-heel and the cross-bolt passing through said heel and washer to join them in set relation with the links, substantially as described.

WILLIAM SOBEY.

Witnesses:

HENRY MITCHELL WALLIS, ROBERT EARL BUsnELL. 

